Title:
DIELECTRIC LENS
Document Type and Number:
Japanese Patent JPS5563101
Kind Code:
A
Abstract:
A foamed plastics dielectric lens 16 having a comparatively low dielectric constant of between 1.05 and 1.5 serves to produce a plane wave of uniform phase and is provided on one surface with means 30 to control extraneous energy contributed by reflections from the face of the lens, comprising two layers of high-performance absorber material 34,36. The lens is particularly suitable for use in an antenna test facility, the amplitude characteristics in the test region being controlled by appropriate selection of the source antenna. Radiation- absorbent wall lining material is also provided in the test facility to eliminate amplitude distortion. This makes possible testing under far-field conditions in test cells of modest size. The lens can be a plano- convex or meniscus lens and can be manufactured from any plastics having a suitable dielectric constant, by either blowing the plastics in a suitable mould, or by machining from a preformed foam block. The absorber layers are loaded with conductive carbon to provide desired insertion loss and attached to the face of the lens by a coupling section 32.
Inventors:
RERANDO ETSUCHI HEMINGU
Application Number:
JP10770279A
Publication Date:
May 13, 1980
Filing Date:
August 25, 1979
Export Citation:
Assignee:
PLESSEY INC
International Classes:
H01Q15/08; H01Q15/02; H01Q17/00; H01Q19/06; (IPC1-7): H01Q15/08; H01Q15/10; H01Q19/06